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SOLAR/1045-78/11 



Monthly 

Performance 

Report 



MONTECITO PINES 
NOVEMBER 1978 




U.S. Department of Energy 



National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 
MONTECITO PINES 
NOVEMBER 1978 

I. SYSTEM DESCRIPTION 

The Montecito Pines site is an apartment complex in Santa Rosa, California. 
It consists of one instrumented unit containing eight apartments. Each 
apartment has approximately 864 square feet of conditioned space. Solar 
energy is used for space heating and preheating domestic hot water (DHW). 
The solar energy system which serves the 8-apartment unit has an array of 
flat-plate collectors with a gross area of 950 square feet. The array faces 
22 degrees west of south at an angle of 45 degrees to the horizontal. Water 
is the transfer medium that delivers solar energy from the collector array to 
storage and to the space heating and hot water loads. Freeze protection is 
provided by drain down. Solar energy is stored underground in a 2000-gallon 
insulated tank. City water is circulated through a heat exchanger in the 
storage tank for preheating before entering a gas-fired boiler which supplies 
DHW on demand. When solar energy is insufficient to satisfy the space heating 
load, the gas-fired boiler provides auxiliary energy for space heating. The 
system, shown schematically in Figure 1, has four modes of solar operation. 

Mode I - Collector-to-Storage : This mode activates when the collector plate 
temperature exceeds the storage temperature by 17°F and terminates when a 
temperature difference of 3°F is reached. Collector loop pump PI is operating. 

Mode 2 - Storage-to-Space Heating : This mode activates when there is a space 
heating demand and the temperature at the top of the storage tank is 105°F or 
higher. Space heating pump P2 is operating and mode diversion valves VI and 
V2 divert the flow to the heat exchanger in the storage tank and bypass the 
gas-fired boiler. 

Mode 3 - Auxiliary Space Heating, DHW Preheating : This mode activates when 
there is a space heating demand and the temperature at the top of the storage 
tank is less than 105°F. Space heating pump P2 is operating and mode diversion 
valves VI and V2 direct the flow through the gas-fired boiler and bypass the 
heat exchanger in the storage tank. 

Mode 4 - DHW Preheating : This mode activates when there is a demand for DHW. 

Incoming city water passes through the heat exchanger in the storage tank on 

the way to the gas-fired boiler which supplies hot water, on demand, to the 
apartments. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The solar energy system operated continuously during the month of November. 
Daily average solar radiation and ambient temperature were both below their 




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long-term averages for November. Operational incident solar energy was 90 
percent of total incident solar energy; approximately 30 percent of the 
incident solar energy was collected. Average storage temperature decreased 
slightly in November. The solar energy system satisfied a significant portion 
of the DHW and space heating loads in November. 

WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 
35.1 million Btu for a daily average of 1230 Btu per square foot. This was 
below the estimated average daily solar radiation for this geographical area 
during November of 1366 Btu per square foot for a plane facing 22 degrees west 
of south with a tilt of 45 degrees to the horizontal. The average ambient 
temperature during November was 48°F as compared with the long-term average 
for November of 54°F. 



THERMAL PERFORMANCE 

Col lector - The total incident solar radiation on the collector array for the 
month of November was 35.1 million Btu. During the period the collector 
loop was operating, the total insolation amounted to 31.7 million Btu. The 
total collected solar energy for the month of November was 10.0 million Btu, 
resulting in a collector array efficiency of 29 percent, based on total 
incident insolation. Solar energy delivered from the collector array to 
storage was 8.3 million Btu. No solar energy was delivered from the col- 
lector array directly to the loads. Energy loss during transfer from the 
collector array to storage was 1.7 million Btu; this loss represented 17 
percent of the energy collected. Operating energy required by the collector 
loop was 0.56 million Btu. 

Storage - Solar energy delivered to storage was 8.3 million Btu. There were 
7.1 million Btu delivered from storage to the DHW and space heating sub- 
systems. Energy loss from storage was 1.2 million Btu; this loss represented 
15 percent of the energy delivered to storage. The storage efficiency was 
85 percent: This is calculated as the ratio of the sum of the energy removed 
from storage and the change in stored energy, to the energy delivered to 
storage. The average storage temperature for the month was 106°F. 

DHW Load - The DHW subsystem consumed 1.7 million Btu of solar energy and 4.9 
million Btu of auxiliary thermal energy (equivalent to 6.1 million Btu of 
auxiliary fossil fuel energy) to satisfy a hot water load of 5.3 million Btu. 
The solar fraction of this load was 31 percent. Losses from the DHW subsystem 
were 1.3 million Btu. The DHW subsystem consumed a total of 0.70 million Btu 
of operating energy. A daily average of 285 gallons of DHW was consumed at 
an average temperature of 143°F delivered from the tank. 

Space Heating Load - The space heating subsystem consumed 3.3 million Btu of 
solar energy and 23.7 million Btu of auxiliary thermal energy (equivalent to 
29.6 million Btu of auxiliary fossil fuel energy) to satisfy a space heating 



load of 19.5 million Btu. The solar fraction of this load was 15 percent. 
Losses from the space heating subsystem were 7.5 million Btu. The space 
heating subsystem consumed a total of 2.2 million Btu of operating energy. 

OBSERVATIONS 

In this report a value of 1050 has been substituted for the previously used 
value of 1667 Btu per cubic foot of gas. The new value is a better estimate 
of the thermal content of the gas delivered to the apartments. 

Sensor anomalies in the DHW recirculation loop occurred in November. 



ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 8.2 
million Btu at an expense of 0.56 million Btu of electrical energy. The DHW 
subsystem provided a fossil fuel energy savings of 2.8 million Btu, while the 
space heating subsystem contributed a fossil fuel energy savings of 5.5 
mill ion Btu. 



III. ACTION STATUS 

IBM and Boeing will investigate and correct these anomalies during a January 
site visit. 



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